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Universe
Private households in Northern Ireland.;Households;National
Sampling
Multi-stage stratified random sample;The sample is drawn as a simple random sample from three strata. The first of these strata is the Belfast District Council area. The other two are formed by dividing the remainder of the province into East and West along district council boundaries. Within each of these strata a simple random sample of addresses is drawn, with size proportional to the distribution of domestic addresses on the rating list.
Study Type
Repeated cross-sectional study. Data are collected annually.